/// <summary>
/// Allows the game to run logic such as updating the world,
/// checking for collisions, gathering input, and playing audio.
/// </summary>
/// <param name="gameTime">Provides a snapshot of timing values.</param>
protected override void Update(GameTime gameTime)
{
#region Label U1: use Touch Location to check for selection
//obtain all of the devices TouchLocations
TouchCollection touchCollection = TouchPanel.GetState();
//check each of the devices TouchLocations;
foreach (TouchLocation tl in touchCollection)
{
/*
* Utilize the touch location state.
* -TouchLocationState.Invalid is when the location's position is invalid. Could be when a new
* touch location attempts to get the previous location of itself.
* -TouchLocationState.Moved is when the touch location position was updated or pressed in the same position.
* -TouchLocationState.Pressed is when the touch location position is new.
* -TouchLocationState.Released is when the location position was released.
*/
switch (tl.State)
{
case TouchLocationState.Pressed:
// Priotize the selction
// System.Diagnostics.Debug.WriteLine("Pressed: TouchID=" + tl.Id);
mCurrentSelected = null;
if (mBall.Selected(tl.Position))
mCurrentSelected = mBall;
break;
case TouchLocationState.Moved:
// with TouchID, will not "drop" the image when movement is very fast!
// if (null != mCurrentSelected)
// mCurrentSelected.DragTo(tl.Id, tl.Position);
//
// One should not mix touch.Move with gesture.
// here we are working with Gesture, so, check for FreeDrag
break;
case TouchLocationState.Released:
if (null != mCurrentSelected)
mCurrentSelected.UnSelect();
mCurrentSelected = null;
break;
}
}
#endregion
#region Label U2: Working with gesture: on selected image
while (TouchPanel.IsGestureAvailable)
{
//detect any gestures that were performed
GestureSample gesture = TouchPanel.ReadGesture();
//do code depending on which gesture was detected
switch (gesture.GestureType)
{
case GestureType.Pinch:
// Only work with mBg image.
// Sets the markers to be visible and at pinch position
mMarker1.IsVisible = true;
mMarker2.IsVisible = true;
mMarker1.SetPositionTo(gesture.Position);
mMarker2.SetPositionTo(gesture.Position2);
break;
case GestureType.PinchComplete:
// now hid the markers
mMarker1.IsVisible = false;
mMarker2.IsVisible = false;
break;
case GestureType.FreeDrag:
// drags which the selected image
if (null != mCurrentSelected)
mCurrentSelected.SetPositionTo(gesture.Position);
break;
case GestureType.DoubleTap:
break;
case GestureType.Tap:
// Always reposition the ball
mBall.SetPositionTo(gesture.Position);
mBall.SetVelocity(Vector2.Zero);
mBeep.Play();
break;
case GestureType.Hold:
// Always reposition the ball
mBall.SetPositionTo(gesture.Position);
mBall.SetVelocity(Vector2.Zero);
mBeep.Play();
break;
case GestureType.Flick:
// Transfer the flick-delta to the ball,
// scale down the veocity to have
// a resonable speed for the ball
if (mBall == mCurrentSelected)
mBall.SetVelocity(gesture.Delta * 0.2f);
break;
}
}
#endregion
#region Label U3: In case the ball is kicked
mBall.Update();
#endregion
#region Label U4: Usual XNA stuff: Allows the game to exit and base.Update
if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed)
this.Exit();
base.Update(gameTime);
#endregion
// Allows the game to exit
if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed)
this.Exit();
// TODO: Add your update logic here
base.Update(gameTime);
}
